Carrier PC211 specifications Benshaw, Inc. Solid-State Starter Troubleshooting Guide

Table 12 — Benshaw, Inc. Solid-State Starter Troubleshooting Guide (Continued)

Problem	Probable Causes		Area of Correction
AK board power	AK board not functioning		Replace board.
applied, run command	properly.
given, starter at full
voltage, but aux LED
not lit.
1L boards LEDs lit.	Motor terminal voltage		Check motor terminal voltages for imbalance between
	phase imbalance exists.		phases. If an imbalance exists, check for loose SCR gate
			or open SCR gate. Replace phase assembly, if necessary.
BC board LED L4 and	BC board not functioning		Replace board.
L5 not lit.	properly.
BC board LED L3 lit.	1.	FU5 and FU6 fuses not	1.	Check fuses FU5 and FU6. Replace if necessary.
	2.	functioning properly.	2.
		Phase assembly not		Verify that bypass is pulling in by measuring the voltage
		functioning properly.		drop across the contacts. The reading should be 50 mV
	3.	Fan not functioning	3.	or less. Replace phase assembly, if necessary.
		properly.		Verify fan operation on each phase for 200 amp units.
				Replace fan, if necessary.
BC board L2 lit.	SCR phases not function-		Measure resistance from anode to cathode for each SCR
	ing properly.		phase assembly. Replace shorted phase, if necessary.
BC board L1 lit.	Motor lead grounded.		Megger motor to test for motor lead going to ground.
Start command given.	Motor does not begin rota-		Turn ‘Starting Torque’ potentiometer RV2 clockwise until
	tion.		motor rotation begins.
Motor does not reach	Ramp up setting is not cor-		Turn ‘Ramp’ potentiometer RV1 counterclockwise. Restart
full speed within 25	rect.		motor and verify that motor reaches full speed within 25
seconds.			seconds.
115 vac missing from	1.	CB2 is not on.	1.	Verify CB2 is on.
LL1 and LL2.	2.	Fuse no. 4 (FU4) blown.	2.	Check FU4 for continuity. Replace, if necessary.
SMM not responding.	1.	CB4 is not on.	1.	Verify CB4 is on.
	2.	Potentiometer RV1	2.	Adjust potentiometer RV1 for 24 vac at SMM terminals
		needs adjustment.		J3-23 and J3-24.

Legend

LED — Light-Emitting Diode

SCR — Silicon Control Rectifier

SMM — Starter Management Module